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 Derivation of Bernoulli's principle 
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Post Re: Derivation of Bernoulli's principle
interesting... :shock:


November 06, 2007, 04:02:40 AM
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Post Re: Derivation of Bernoulli's principle
That's all completely theoretical, though, because we have a constant gravity pull anyway..


January 09, 2008, 09:30:24 AM
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Post Re: Derivation of Bernoulli's principle
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Which is Bernoulli's principle for an ideal fluid in the absence of gravity


IE: Space

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January 09, 2008, 01:54:06 PM
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Post Re: Derivation of Bernoulli's principle
Jason wrote:
Quote:
Which is Bernoulli's principle for an ideal fluid in the absence of gravity


IE: Space


Space still has gravity.


January 10, 2008, 08:07:04 AM
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Post Re: Derivation of Bernoulli's principle
In most of the space gravity is ignorably little.

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January 10, 2008, 09:35:18 AM
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Post Re: Derivation of Bernoulli's principle
Everything is theoretical :yes: With an absence of gravity I meant a theoretical environment where no gravity forces influence the flow.

To keep gravity into account you just have to include the terms of body forces (this will add [fluid density] × [gravity constant] × [change in height] to both sides). In a steady 2D situation this isn't always necessary since the flow only varies in dynamic pressure if there's a change in potential energy. The only way gravity can influence a steady 2D flow is through friction.


January 10, 2008, 12:00:16 PM
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Post Re: Derivation of Bernoulli's principle
Wierd delta icons :S
and where are the gravity units?

I think all units are different in some countries.
In Sweden we uses:
g = gravity (9.89 i think it is on earth, 7 something on the moon)
P = Power (Watt or horsepower)

maybe you should explain what all units means? :)
Nice done, even if I don't understand much about that formel

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January 27, 2008, 10:58:45 PM
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Post Re: Derivation of Bernoulli's principle
Iderik wrote:
Wierd delta icons :S
and where are the gravity units?

I think all units are different in some countries.
In Sweden we uses:
g = gravity (9.89 i think it is on earth, 7 something on the moon)
P = Power (Watt or horsepower)

maybe you should explain what all units means? :)
Nice done, even if I don't understand much about that formel


By that I guess your in the ninth grade. Am I wrong? or atleast you haven't read physics at "Gymnasiet" yet.

g is indead gravity in most cases (9.81 in central sweden, and what you should use)
p in this case isn't a p, but the 'sign' for density (I think it is).

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January 28, 2008, 12:08:44 AM
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Post Re: Derivation of Bernoulli's principle
Fawenah wrote:
Iderik wrote:
Wierd delta icons :S
and where are the gravity units?

I think all units are different in some countries.
In Sweden we uses:
g = gravity (9.89 i think it is on earth, 7 something on the moon)
P = Power (Watt or horsepower)

maybe you should explain what all units means? :)
Nice done, even if I don't understand much about that formel


By that I guess your in the ninth grade. Am I wrong? or atleast you haven't read physics at "Gymnasiet" yet.

g is indead gravity in most cases (9.81 in central sweden, and what you should use)
p in this case isn't a p, but the 'sign' for density (I think it is).


Im studying energy in "Gymnasiet".
For density we use C

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January 28, 2008, 01:28:10 PM
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Post Re: Derivation of Bernoulli's principle
Iderik wrote:
Wierd delta icons :S
and where are the gravity units?

I think all units are different in some countries.
In Sweden we uses:
g = gravity (9.89 i think it is on earth, 7 something on the moon)
P = Power (Watt or horsepower)

maybe you should explain what all units means? :)
Nice done, even if I don't understand much about that formel


t = time [s]
ϑ = volume [m³]
ρ = fluid density [kg/m³]
V = velocity [m/s]
S = surface [m²]
p = pressure [N/m²]
f = bodyforce per unit mass [N/kg]
F = force [N]
g = gravity constant [m/s²] (= 9.80655 m/s² on sealevel)

That 'weird' delta sign is nabla.


January 28, 2008, 03:13:59 PM
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Post Re: Derivation of Bernoulli's principle
Iderik wrote:
Im studying energy in "Gymnasiet".
For density we use C


You'r sure your not thinking about concentration?

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January 28, 2008, 07:45:36 PM
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Post Re: Derivation of Bernoulli's principle
Fawenah wrote:
Iderik wrote:
Im studying energy in "Gymnasiet".
For density we use C


You'r sure your not thinking about concentration?


Ops, got it all wrong :P
But i have learned that C is heat capicity (Like for water its 4.2 kJ/kg)

Im still learned :P

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January 29, 2008, 05:26:20 PM
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Post Re: Derivation of Bernoulli's principle
Iderik wrote:
Fawenah wrote:
Iderik wrote:
Im studying energy in "Gymnasiet".
For density we use C


You'r sure your not thinking about concentration?


Ops, got it all wrong :P
But i have learned that C is heat capicity (Like for water its 4.2 kJ/kg)

Im still learned :P


Don't forget the 'K'! (4.19kJ/kg*K) it would probably lose you a point on a test due to using the wrong unit.

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January 29, 2008, 07:14:53 PM
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Post Re: Derivation of Bernoulli's principle
I said this 4 months ago and I'm saying it again. I disagree.


January 31, 2008, 05:21:50 PM
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Post Re: Derivation of Bernoulli's principle
Gardius wrote:
I said this 4 months ago and I'm saying it again. I disagree.


I disagree to disagree.

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January 31, 2008, 06:07:54 PM
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